smatovic

SPMD on 5770

Discussion created by smatovic on Jun 2, 2010
Latest reply on Jun 21, 2010 by MicahVillmow
Does the Processing Elements have their own instruction counter?

Heyho,

 

i developed on an NV 8800GT and had to realize that every if-else doubled the runtime.

 

What about the ATI 5770, does it provide "real" SPMD with own instruction counters, so one process executes the if and the other executes the else only?

 

The OpenCL documentation mentions only that if the local work group size is set to 1 than the gpu should work in SPMD "mode".

 

Regards,

Srdja

Outcomes